Whip cream, liqueur, cinnamon and chili powder together until stiff peaks form. Melt chocolate in a medium bowl in microwave until smooth, check on it every 10 seconds over 45 seconds, cooking on high. Cool to the touch. Stir 1/4 of the whipped cream into the chocolate until totally combined then fold in the rest of the whipped cream in small batches. Cut pie, top with cream and serve immediately.